Table 5. Values of K_ads and ΔG°_ads Obtained from the Langmuir Adsorption Isotherm Graphs for the Studied Inhibitors on Mild Steel in 5% HCl at 303 K.

inhibitor	method	slope	Kads (ppm/mol)	–ΔG°ads (kJ mol–1)
ZnO/PEG	EIS	1.390	0.0416	26.80
	PDP	1.644	0.0224	25.23
	LPR	1.537	0.0231	25.31
ZnO/PVP	EIS	1.082	0.0384	26.59
	PDP	1.316	0.0345	26.32
	LPR	1.415	0.0748	28.27
ZnO/PAN	EIS	1.018	0.0044	21.12
	PDP	1.066	0.0069	22.26
	LPR	1.122	0.0071	22.35